2'-O-methylation in mRNA disrupts tRNA decoding during translation elongation.

2'-O-methylation in mRNA disrupts tRNA decoding during translation elongation.
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DOI:
10.1038/s41594-018-0030-z
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发表时间:
2018-03
影响因子:
16.8
通讯作者:
Puglisi JD
Puglisi JD
中科院分区:
生物学1区
文献类型:
--
作者:
Choi J;Indrisiunaite G;DeMirci H;Ieong KW;Wang J;Petrov A;Prabhakar A;Rechavi G;Dominissini D;He C;Ehrenberg M;Puglisi JD

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信使RNA(mRNA)的化学修饰可以调节mRNA加工和蛋白质合成的许多方面。近年来,核苷酸2′-O-甲基化被认为是人类mRNA翻译区的一种常见修饰,表现为某些氨基酸密码子的富集。在这里,使用单分子,整体动力学和结构的方法,我们表明,2′-O-甲基化的mRNA编码区破坏关键步骤中的密码子阅读在同源转移RNA(tRNA)的选择。我们的研究结果表明,2′-O-甲基化空间干扰核糖体监测碱基(G530,A1492和A1493)与同源密码子-反密码子螺旋的相互作用,从而抑制下游GTP水解的延伸因子Tu(EF-Tu)和A-位点tRNA的住宿,导致过度排斥同源氨酰化的tRNA在初始选择和校对。我们目前和以前的研究结果强调了mRNA的化学修饰如何在翻译延伸的不同步骤中调节蛋白质合成的动力学。
Chemical modifications of messenger RNA (mRNA) may regulate many aspects of mRNA processing and protein synthesis. Recently, 2′-O-methylation of nucleotides was identified as a frequent modification in translated regions of human mRNA, showing enrichment in codons for certain amino acid. Here, using single-molecule, bulk kinetics and structural methods, we show that 2′-O-methylation within coding regions of mRNA disrupts key steps in codon reading during cognate transfer RNA (tRNA) selection. Our results suggest that 2′-O-methylation sterically perturbs interactions of ribosomal monitoring bases (G530, A1492 and A1493) with cognate codon-anticodon helices, thereby inhibiting downstream GTP-hydrolysis by elongation factor Tu (EF-Tu) and A-site tRNA accommodation, leading to excessive rejection of cognate aminoacylated-tRNAs in initial selection and proofreading. Our current and prior findings highlight how chemical modifications of mRNA tune the dynamics of protein synthesis at different steps of translation elongation.
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